NDLI: Influencing the Part Load Recirculation of a Centrifugal Pump and Avoiding an Instability of the Performance Curve Thereby

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Volume 1A: Symposia, Part 2

Wake Interaction of a Square Cylinder With a Splitter Plate Boundary Layer at a Low Reynolds Number

Wake-Boundary Layer Interactions Behind a Square Cylinder for a Reynolds Number in Periodic Vortex Shedding Regime

Wake-Wake Interactions for a Pair of Staggered Cylinders at Low Reynolds Number (Re = 100)

Design Optimization of a Mixed Flow Waterjet Pump for Performance Improvement Involving Cavitation

Optimization and Validation of Secondary Flow Effect for Flowrange Enhancement in a Low Solidity Circular Cascade Diffuser

Optimal Design of Impeller for Centrifugal Compressor Under the Influence of Fluid-Structure Interaction

Design of Inducer-Impeller Configurations of Self-Priming Vacuum Pump Using Response Surface Method

CFD Analysis of Axial Thrust in Three Stages Centrifugal Pump at Design and Partload Conditions

Development of Shroudless Francis Turbine

Numerical Study on the Main Coolant Pump of Sodium-Cooled Fast Reactor

Conjugate Heat Transfer Analysis of a Rectangular Cooling Channel With 45-Deg Ribs

Studies of the Effect of Vortex-Control Grooves on Pressure Oscillations in a Francis Turbine Draft Tube

Effects of Water-Admission on the Performance of a Centrifugal Pump

Design Optimization of Axial-Flow Pump Blades Based on iSIGHT

Numerical Optimization Research on the Bidirectional Shaft Tubular Pump

The Optimization of Stiffness Performance of Upstream Pumping Mechanical Seal Based on the Response Surface Method

Numerical Simulation of Flow Around Airfoil With Non-Linear RANS Model

Effect of the Accuracy Order of the Discretization Scheme on the Prediction Performance for the Turbulent Flow Structure Inside Fuel Assembly: Sensitivity Study

Numerical Simulation of Three-Dimensional Supercritical Water Flows in Hydrothermal Synthesis Reactors With Arbitrary Geometry

Comparisons of Numerical Methods for Fluid Flow Simulations in a Microorganism Incubating Chamber

Large Eddy Simulation of Through-Flow Effects on Turbulent Heat Transfer Characteristics in Concentric Annulus With Inner Cylinder Rotation

Flow Profiles and Gas/Liquid Separation in First and Second Generation Designs for Ebullated Reactors

Numerical Simulation for Thermal Design of a Gas Water Heater With Turbulent Combined Convection

Performance of Oil Separator According to the Depth of the Outlet Tube

U-RANS Simulation of Single Elbow Pipe Flow Experiments Simulating JSFR Hot-Leg Piping

Development and Elaboration of Numerical Method to Simulate Gas-Liquid-Solid Three-Phase Flows Based on MPS Method

Accuracy Verification of the Turbulent Flame LES Model by a Methane/Air Burner Flame

Turbulent Heat Transfer Enhancement in Round Tubes by Inserting Triple Twisted-Tapes

Thermal-Fluidic Numerical Analysis for the Development of Heat Exchanger in the Propellant Tank Pressurization System of KSLV-II Upper Stage

Modified Unsteady Vortex Lattice Method for Aerodynamics of Flapping Wing Models

Experimental Study on the Forward Flight of the Hawkmoth Using the Dynamically Scaled-Up Robotic Model

3D Volume-of-Fluid (VOF) Based Simulation of Water Impact Problem Using Navier-Stokes Computations

Analysis of Mean Orientation Vector and Mean Curvature in Statistically Steady Turbulent Premixed Combustion

Large Eddy Simulation of Gravity Current Flow Past a Circular Cylinder Using Immersed Boundary Method

Numerical Simulation of Heat Transfer in Shear Flow of Liquid-Solid Two-Phase Media by Immersed Solid Approach

Direct Numerical Simulation of Turbulent Channel Flow With Streamwise System-Rotation

A Meridian Profile Obtained by No Restriction in Optimum Process

Similarity Based Performance Prediction of Organic Rankine Cycle Turbine Using Air Condition Data

Corner Separations Around a NACA65 Blade in a Decelerating Flow

Hydraulic Design and Performance Adjustment of a Reverse Running Pump Turbine Based on a Double Suction Pump

Numerical Prediction of Noise From the Internal Flow in a Centrifugal Blower

High-Efficiency Design Technique of a Single-Channel Submersible Pump Impeller for Waste Treatment

Variation of Hydraulic Performance by Impeller Trimming of a Mixed-Flow Pump

Design Optimization for the Hydraulic Efficiency Improvement of a Mixed-Flow Pump Diffuser

Prediction of the Pressure Pulsation in a Draft Tube for a Part Load Condition Using the LES Approach

Combustion Test of Oxidizer-Rich Single Triplex Injector Preburner for Staged Combustion Cycle Rocket Engine

Research on Structural Optimization for Regenerative-Cooling Thrust Chamber

Effect of Aspect Ratios on the Performance Characteristics of Air Amplifier

Influence of Eccentric Vortex to Performance of Cross Flow Fan

Effect of Port Configurations on the Performance of Hydraulic Actuator

Parameter Optimization and Experimental Research of Small Axial Fans With Splitting Blades

Large-Scale Numerical Simulation of Unsteady Flow Field in a Half-Ducted Propeller Fan Using Lattice Boltzmann Method

Vortex Shedding From Trailing Edge of Rotor Blade of Axial Flow Fan at Design Operating Condition

Turbulence Structure on the Surface of High Speed Liquid Jet

Effects of Flow Loss and Inlet Distortions Caused by Radial Inlet on the Performance of Centrifugal Compressor Stage

Influence of Different Impeller Diameter on Cavitation Performance in an Engine Cooling Water Pump

The Research of Thermal Characteristics of Mechanical Seal Under High Temperature and High Viscosity Medium

Influence Analysis of the Rounding Technique of Spiral Groove Root on the Performance of Upstream Pumping Mechanical Seal

Investigation of Wire Effect in a Wire-Wrapped 37-Pin Fuel Assembly

Investigation of Flatback Airfoil Effect in the Wind Turbine Blade

Effect of Parameter on Characteristics of Active Charge Accumulator for Water Hydraulic System

Wells Turbines With 3-Dimensional Blades: The Performance Under Unsteady Flow Conditions

A Twin Unidirectional Impulse Turbine for Wave Energy Conversion: Effect of Rotor Blade Profile on the Performance

Sound Radiation From Two Side-by-Side Rectangular Cylinders With Slightly Different Aspect Ratios

Fluid-Structure Interaction Analysis for Resonance Investigation of Pump-Turbine Runner

Simulations of Fully Developed Channel Flow by a New High-Resolution Scheme of the Finite-Difference Lattice Boltzmann Method

Near-Wake Flow Structures of a Corner-Chamfered Square Cylinder at Higher Harmonic Excitations

Interference Between a Square and a Circular Cylinder

Aerodynamical Improvement of Delta Wing and Flapping Wing

Numerical Simulation of Supersonic Mixing Enhanced by a Three-Dimensional Cavity Flow

Transonic and Supersonic Flows Past a Rectangular Cavity on Curved Wall

Study on Manufacturing Tolerances for the Laminar Airfoil

Validation of Numerical Analysis to Estimate Airfoil Aerodynamic Characteristics at Low Reynolds Number Region

Numerical Study of Plasma Flow Around a Reentry Vehicle During Atmospheric Reentry With an Unstructured Grid Solver

Aerodynamic Simulation of Closed-Canopy-Type Parafoil for Martian Exploration Mission

A Dynamically Adaptive Lattice Boltzmann Method for Flapping Wing Aerodynamics

Large-Eddy Simulation of Turbulent Flow Over a Heavy Vehicle With Drag Reduction Devices

Lift and Drag Characteristics of an Airfoil and Feedback Flow Control by Flap Actuators in the Low Reynolds Number Region

Drag Reduction of Heavy Vehicles Using Various Side Skirts

Diffusion Control in Circular Jet Using Coaxial Type DBD Plasma Actuator

Effect of Reynolds Number on Coalescence of Droplets in Creeping Flow Through a Tube

Turbulent Annular Pipe Flow in Subcritical Transition Regime: Direct Numerical Simulation of a Large Domain

Development of Removal Technology Using Ozone Microbubble With a Venturi Tube

Effect of Inner Shape on Thermo-Fluid Characteristics of an Electric Vehicle Motor

Development of Efficient Water Purifier by Cavitation Nozzle With Electrode

Gravitational Settling of Glass Fibers on an Air Bubble

Coating Onto a Prewet Substrate With Low Weber Number Liquid Curtain

An Experimental Study on the Heating Process With a Premixed Tubular Flame

Preliminary Investigation on Convective Heat Transfer of Rod Bundle Flow With Spacer Grid for Nuclear Fuel Assembly Application

Electrical Capacitance Tomography Based Sorting Technique for Wasted Plastics

Prediction of Pressure Fluctuation on a Vehicle by Large Eddy Simulation

Aerodynamic Characteristics of a Road Vehicle in Steady-State Cornering

Coupled 6DoF Motion and Aerodynamics Simulation During Pass-By and Overtaken Motions

Towed Underwater SPIV Measurement of Flow Fields Around a Surface-Piercing Cylinder With Free Surface Effects

PIV Measurement of Carbon Dioxide Gas-Liquid Two-Phase Nozzle Flow

Color Particle Image Velocimetry Improved by Decomposition of RGB Distribution Integrated in Depth Direction

Ultrasonic Measurement of Gas Bubbles Advecting Under a Ship Bottom for Investigating Drag Reduction Performance

Measurement Technique for Unsteady Low-Speed Flow Fields Using Poly(TMSP)-Based Pressure Sensitive Paint

Numerical Simulation of Flow Field Around a Circular-Bladed Butterfly Wind Turbine

Influence of Spoke Geometry on Performance and Internal Flow of Contra-Rotating Small-Sized Hydroturbine

Effect of Inlet Nozzle Shape on Performance of Darrieus-Type Hydro-Turbine Operated in Small Open Water Channel

A Twin Unidirectional Impulse Turbine With Fluidic Diode for Wave Energy Conversion

Characteristics of Fresh Water Permeation in Hollow Fiber Membrane Module for Pressure Retarded Osmosis

Relationship Between Velocity Field and Curvature of a Vortex in Two-Dimensional Turbulent Flow

A Study on Particle Sedimentation Depression With Poly Vinyl Alcohol and Surfactant

Simulation of Jet Issued Into Two-Layer Density-Stratified Fluid by Vortex in Cell Method Combined With Immersed Boundary Method

Relationship Between Diffusing-Material Lumps and Organized Structures in Turbulent Flow

The Optimal Formation Condition of the Axis-Symmetry Cyclic Vortex Rings

A Tubular Cross-Flow Filtration Module Based on Chaotic Advection

Geometrical Effects on Fluid Mixing of Pulsatile Flow in Convergent-Divergent Micromixer

Mixing of Matter by a Falling Spherical Particle in a Still Liquid

DNS of Turbulent Channel Flow With a Flexible Square Cylinder

Direct Numerical Simulation of Free Jet Under the Rotational Control

DNS of Heat Transfer Reduction in Viscoelastic Turbulent Channel Flows

Influence of Viscoelasticity on Turbulent Flow Over a Backward-Facing Step

Experimental Investigation of Single Phase Pressure Drop in a Plate Heat Exchanger

PIV-PLIF Experiment on Modification of Turbulent Scalar Diffusion Near the Wall by Uniform Blowing

Turbulent Vorticity Diffusion in the Stronger Wall Jet Managed by a Flat Plate Wing in the Outer Layer

Measurement of the Wall Shear Stress With Sublayer Thin Plate of Thermochromic Liquid Crystal

Efficient Generation of High-Reynolds-Number Homogeneous Turbulence by Disturbances Composed of Two Frequency Components

Effect of Deflected Inflow on Flows in a Strongly-Curved 90 Degree Elbow

Effects of System Rotation on Disturbances Injected Into Laminar Flow

Large Scale Motions and Shear Stress Fluctuations in Turbulent Shear Flow

Experimental and Computational Investigation on Gyromill Wind Turbines Focusing on Wing Camber

Aerodynamics of Clustered Wind Lens Turbines

Performance of a Cross-Flow Wind Turbine Located Above a Windbreak Fence

Wind Tunnel Experiment and CFD Simulation for Multiple Wind Turbine Arrangements

Mixing Technology of Stratified Density Layer by Gas-Liquid Two-Phase Jet

The Effects of Bubble Interface Contamination on Bubble Motion, Bubble-Induced Surrounding Liquid Motion and Mass Transfer

Restructuring Capability of Non-Fractal Aggregate in Simple Shear Flow

Scale-Independent Model on Gravitational Dispersion of Particulate Suspension in Fractal Channels

Wireless Measurement of Fluid Force in Liquid-Solid Flow by Lagrangian Sensor Particle

Flow Characteristics on Fluidized Powder Conveying in a Horizontal Rectangular Channel

Measurement and Analysis on Flow Structure of Inertial Particle Separator

Experimental Characterization of Particle-Laden Air Flow in a Horizontal Pipe

Multidimensional Measurements of Turbulent Boundary Layer Including Scattered Particles Using PIV Technique

Study on Drug Powder Acceleration in a Micro Shock Tube

A Cost-Effective Search of Collision Pairs in Lagrangian Particle Tracking Method

A Numerical Model for the Motion of Large Non-Spherical Object in Fluidized Bed

A Hydraulic Design Procedure of Axial-Flow Pump

Consideration of Sub-Surface Vortices in Suction Sump Using LES

The Numerical Analysis of Control Effect on Cavitation Instabilities in a Cascade With a Random Slit

Internal Flow Condition of Fluid Food Pump Using Semi-Open Impeller

Flow Instability in Off Design Condition of Vaned and Vaneless Diffuser Centrifugal Pump

Study of the Flow Field and Performances of a Centrifugal Pump During Unstable Operating Conditions by CFD

Blockage and Distortion Effects on a Vane Island Type Diffuser Performance of Centrifugal Pumps for Various Flow Rates

Clarification of Performance Curve Instability Mechanism Using Large Eddy Simulation of Internal Flow of a Mixed-Flow Pump

The Effect of Tip Leakage Vortex on Cavitation Performance in Axial Hydro Turbine

Unsteady Flow due to Cavitation in Mixed Flow Pumps Second Report: The Effect of Tip Vortex Cavitation on Hydraulic Force

Numerical Investigation on Performance of Contra-Rotating Axial Flow Pump With Different Rear Rotor Design

Investigation on Rotor-Stator Interaction in a Low Specific Speed Centrifugal Pump

Measurements of Axial and Radial Thrust Forces Working on a Three-Stages Centrifugal Pump Rotor

Cavitation Flow Structure and Unsteady Pressure Pulsation Around a Hydrofoil

Simple Vibration Diagnosis and Experimental Verification Using Eccentricity Shaker

Large Eddy Simulation of Unsteady Vortices in a Pump Sump

Influencing the Part Load Recirculation of a Centrifugal Pump and Avoiding an Instability of the Performance Curve Thereby

Avoiding Sedimentation and Air Entrainment in Pump Sump for Wet Pit Pumping Stations

Adaptive Blade Systems for Increased Operating Range of a Turbomachine

Linking Efficiency to Functional Performance by a Pump Test Standard for Wastewater Pumps

PIV Measurements in Diffuser of the Radial Pump

Volume 2A: Fora, Part 2

Volume 1: Symposia

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Influencing the Part Load Recirculation of a Centrifugal Pump and Avoiding an Instability of the Performance Curve Thereby

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mengdehl, Tino Palamarchuk, Evgenii Garlach, Angela Jacobsen, Christian Brix Thamsen, Paul Uwe
Copyright Year	2015
Abstract	Centrifugal pumps of low specific speed display an inherent tendency to generate an unstable pump performance curve [1]. These curves are characterized by a head dropping at low flow rates that limits the operational range. Hence, for example centrifugal pumps with such performance curves are not suitable for a usage in firefighting applications or parallel operation. However, there are a few actions that influence positively the stability of the performance curve [1, 2]. One is adding slots at the rear shroud, e.g. on the pressure side or the suction side of the blade. Slots at the pressure side of the blade stabilize the characteristic curve by increasing the head, while suction-side slots stabilize the characteristic curve by dropping it down [2]. The part load flow pattern of a centrifugal pump includes two recirculation zones. The first is located at the inlet of the impeller and caused by the blade suction geometry. The second recirculation zone forms at the outlet of the impeller. It is known that the recirculation zone at the pressure side of a radial impeller has various positions, sizes and structures depending on initial conditions [3]. This paper deals with the assumption that influencing the pressure side recirculation zone leads to a stable pump performance curve. Therefore the structure of the recirculation zone at the impeller outlet is being investigated and analyzed whereas geometrical changes on a centrifugal pump impeller are performed. The tests contain an experimental setup and compare the results to numerical simulations. Subject of the experimental investigations is a centrifugal pump with a specific speed of 33 min−1, a flow rate of 650 m3/h and head of 47 m for the Nominal Point. Measurements are performed for analyzing the time resolved pressure fluctuations and visualizing the flow structures in the volute casing by using pressure transducers and particle image velocimetry (PIV). These data show the changing pressure and velocity field and enable an analyzing of the part load recirculation. Furthermore, the measured operational points and the time resolved pressure data are compared to numerical simulations that are carried out by Computational Fluid Dynamics (hereafter: CFD). The flow pattern gained by CFD allows analyzing the phenomena of the pressure side recirculation in detail, also in areas where the access with measuring instruments is limited. Within the present study different geometrical parameters are subsequently changed on the original impeller design. This concerns, for example, the earlier named slots in the rear shroud both on suction and pressure side of the blade. Results show an influence of these subsequent design methods on the performance curve as well as on the efficiency of the centrifugal pump. Additionally, the time resolved pressure data are used for a validation of the CFD simulations and both results show a significant influence of the flow structure at the impeller outlet on the performance curve. Therefore, it can be shown that the recirculation zone of the impeller is affected by these actions.
Sponsorship	Fluids Engineering Division
File Format	PDF
ISBN	9780791857328
DOI	10.1115/AJKFluids2015-33760
Volume Number	Volume 1A: Symposia, Part 2
Conference Proceedings	ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
Language	English
Publisher Date	2015-07-26
Publisher Place	Seoul, South Korea
Access Restriction	Subscribed
Subject Keyword	Suction Stability Blades Computational fluid dynamics Computer simulation Design methodology Measuring instruments Centrifugal pumps Pressure Flow (dynamics) Stress Design Geometry Simulation Pumps Impellers Particulate matter Fluctuations (physics) Engineering simulation Pressure transducers
Content Type	Text
Resource Type	Article

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